| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Meio Ambiente. |
|
Data corrente: |
11/01/2011 |
|
Data da última atualização: |
15/10/2015 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
JONSSON, C. M.; AOYAMA, H. |
|
Afiliação: |
CLAUDIO MARTIN JONSSON, CNPMA; Hiroshi Aoyama, Instituto de Biologia - UNICAMP. |
|
Título: |
Effect of copper on the activation of the acid phosphatase from the green algae Pseudokirchneriella subcapitata. |
|
Ano de publicação: |
2010 |
|
Fonte/Imprenta: |
BioMetals, Oxford, v. 23, p. 93-98, 2010. |
|
DOI: |
10.1007/s10534-009-9270-z |
|
Idioma: |
Inglês |
|
Conteúdo: |
The presence of copper in water environment may have detrimental effects on aquatic organisms, including algae, where different enzymatic systems can be affected. Algae acid phosphatase plays important roles in metabolic processes such as decomposition of organic phosphate, autophagic digestive process, recycling cellular materials and zygote formation during reproduction. This work describes an in vitro activation effect of copper on the acid phosphatase of the green algae Pseudokirchneriella subcapitata (formely Selenastrum capricornutum) under preincubation condition. Apparent Michaelis constant values of 1.21 and 0.37 mM, and activation energy values of 26.8 and 13.6 kJ mol-1 were determined in the absence and in the presence of 0.2 mM Cu2+, respectively. The dissociation constant value for Cu2+ binding to the enzyme was determined to be 22.04 uM. The decrease of the apparent Michaelis constant (Km) and activation energy values in the presence of Cu2+ correlates well with its activating effect on the acid phosphatase activity. This propriety could be used as a sensitive bioindicator for copper in environmental samples. |
|
Thesagro: |
Fosfatase Ácida. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 01625naa a2200157 a 4500
001 1872588
005 2015-10-15
008 2010 bl --- 0-- u #d
024 7 $a10.1007/s10534-009-9270-z$2DOI
100 1 $aJONSSON, C. M.
245 $aEffect of copper on the activation of the acid phosphatase from the green algae Pseudokirchneriella subcapitata.
260 $c2010
520 $aThe presence of copper in water environment may have detrimental effects on aquatic organisms, including algae, where different enzymatic systems can be affected. Algae acid phosphatase plays important roles in metabolic processes such as decomposition of organic phosphate, autophagic digestive process, recycling cellular materials and zygote formation during reproduction. This work describes an in vitro activation effect of copper on the acid phosphatase of the green algae Pseudokirchneriella subcapitata (formely Selenastrum capricornutum) under preincubation condition. Apparent Michaelis constant values of 1.21 and 0.37 mM, and activation energy values of 26.8 and 13.6 kJ mol-1 were determined in the absence and in the presence of 0.2 mM Cu2+, respectively. The dissociation constant value for Cu2+ binding to the enzyme was determined to be 22.04 uM. The decrease of the apparent Michaelis constant (Km) and activation energy values in the presence of Cu2+ correlates well with its activating effect on the acid phosphatase activity. This propriety could be used as a sensitive bioindicator for copper in environmental samples.
650 $aFosfatase Ácida
700 1 $aAOYAMA, H.
773 $tBioMetals, Oxford$gv. 23, p. 93-98, 2010.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Meio Ambiente (CNPMA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Florestas. |
|
Data corrente: |
13/12/2018 |
|
Data da última atualização: |
13/12/2018 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 1 |
|
Autoria: |
DECÄENS, T.; MARTINS, M. B.; FEIJOO, A.; OSZWALD, J.; DOLEDEC, S.; MATHIEU, J.; SARTRE, X. A. de; BONILLA, D.; BROWN, G. G.; CRIOLLO, Y. A. C.; DUBS, F.; FURTADO, I. S.; GOND, V.; GORDILLO, E.; LE CLEC'H, S.; MARICHAL, R. el; MITJA, D.; SOUZA, I. M. de; PRAXEDES, C.; ROUGERIE, R.; RUIZ, D. H.; OTERO, J. T.; SANABRIA, C.; VELASQUEZ, A.; ZARARTE, L. E. M.; LAVELLE, P. |
|
Afiliação: |
Thibaud Decaens, Centre d’Ecologie Fonctionnelle et Evolutive; Marlucia B. Martins, Museu Paraense Emilio Goeldi; Alexander Feijoo, 3Universidad Tecnologica de Pereira; Johan Oszwald, Université de Rennes; Sylvain Doledec, Université Lyon; Jérôme Mathieu, Sorbonne Universités; Xavier Arnaud de Sartre, Université de Pau et des Pays de l’Adour; Diego Bonilla, Insectos de Colombia; GEORGE GARDNER BROWN, CNPF; Yeimmy Andrea Cuellar Criollo, Universidad de la Amazonia; Florence Dubs, IRD, iEES Paris; Ivaneide S. Furtado, Museu Paraense Emilio Goeldi; Valérie Gond, CIRAD; Erika Gordillo, Universidad de la Amazonia; Solen Le Clec’h, Université de Rennes; Rapha el Marichal, CIRAD; Danielle Mitja, IRD, UMR Espace-DEV; Izildinha Miranda de Souza, Universidade Federal Rural da Amazˆonia; Catarina Praxedes, Museu Paraense Emilio Goeldi; Rodolphe Rougerie, Muséum national d'Histoire naturelle; Darío H. Ruiz, Universidad Tecnológica de Pereira; Joel Tupac Otero, Universidad Nacional de Colombia; Catalina Sanabria, Universidad del Valle; Alex Velasquez, Universidad de la Amazonia; Luz Elena M. Zararte, Instituto Tecnol´ogico del Putumayo; Patrick Lavelle, Centro Internacional de Agricultura Tropical. |
|
Título: |
Biodiversity loss along a gradient of deforestation in Amazonian agricultural landscapes. |
|
Ano de publicação: |
2018 |
|
Fonte/Imprenta: |
Conservation Biology, v. 32, n. 6, p. 1380-1391, Dec. 2018. |
|
DOI: |
10.1111/cobi.13206 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Assessing how much management of agricultural landscapes, in addition to protected areas, can offset biodiversity erosion in the tropics is a central issue for conservation that still requires cross-taxonomic and landscape-scale studies. We measured the effects of Amazonia deforestation and subsequent land-use intensification in 6 agricultural areas (landscape scale), where we sampled plants and 4 animal groups (birds, earthworms, fruit flies, and moths). We assessed land-use intensification with a synthetic index based on landscape metrics (total area and relative percentages of land uses, edge density, mean patch density and diversity, and fractal structures at 5 dates from 1990 to 2007). Species richness decreased consistently as agricultural intensification increased despite slight differences in the responses of sampled groups. Globally, in moderately deforested landscapes species richness was relatively stable, and there was a clear threshold in biodiversity loss midway along the intensification gradient, mainly linked to a drop in forest cover and quality. Our results suggest anthropogenic landscapes with high-quality forest covering >40 % of the surface area may prevent biodiversity loss in Amazonia. |
|
Palavras-Chave: |
Biodiversity conservation; Biodiversity erosion; Intensificação da paisagem; Land-use changes; Landscape intensification; Threshold. |
|
Thesagro: |
Biodiversidade; Conservação; Erosão. |
|
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
|
Marc: |
LEADER 02705naa a2200541 a 4500
001 2101415
005 2018-12-13
008 2018 bl uuuu u00u1 u #d
024 7 $a10.1111/cobi.13206$2DOI
100 1 $aDECÄENS, T.
245 $aBiodiversity loss along a gradient of deforestation in Amazonian agricultural landscapes.$h[electronic resource]
260 $c2018
520 $aAssessing how much management of agricultural landscapes, in addition to protected areas, can offset biodiversity erosion in the tropics is a central issue for conservation that still requires cross-taxonomic and landscape-scale studies. We measured the effects of Amazonia deforestation and subsequent land-use intensification in 6 agricultural areas (landscape scale), where we sampled plants and 4 animal groups (birds, earthworms, fruit flies, and moths). We assessed land-use intensification with a synthetic index based on landscape metrics (total area and relative percentages of land uses, edge density, mean patch density and diversity, and fractal structures at 5 dates from 1990 to 2007). Species richness decreased consistently as agricultural intensification increased despite slight differences in the responses of sampled groups. Globally, in moderately deforested landscapes species richness was relatively stable, and there was a clear threshold in biodiversity loss midway along the intensification gradient, mainly linked to a drop in forest cover and quality. Our results suggest anthropogenic landscapes with high-quality forest covering >40 % of the surface area may prevent biodiversity loss in Amazonia.
650 $aBiodiversidade
650 $aConservação
650 $aErosão
653 $aBiodiversity conservation
653 $aBiodiversity erosion
653 $aIntensificação da paisagem
653 $aLand-use changes
653 $aLandscape intensification
653 $aThreshold
700 1 $aMARTINS, M. B.
700 1 $aFEIJOO, A.
700 1 $aOSZWALD, J.
700 1 $aDOLEDEC, S.
700 1 $aMATHIEU, J.
700 1 $aSARTRE, X. A. de
700 1 $aBONILLA, D.
700 1 $aBROWN, G. G.
700 1 $aCRIOLLO, Y. A. C.
700 1 $aDUBS, F.
700 1 $aFURTADO, I. S.
700 1 $aGOND, V.
700 1 $aGORDILLO, E.
700 1 $aLE CLEC'H, S.
700 1 $aMARICHAL, R. el
700 1 $aMITJA, D.
700 1 $aSOUZA, I. M. de
700 1 $aPRAXEDES, C.
700 1 $aROUGERIE, R.
700 1 $aRUIZ, D. H.
700 1 $aOTERO, J. T.
700 1 $aSANABRIA, C.
700 1 $aVELASQUEZ, A.
700 1 $aZARARTE, L. E. M.
700 1 $aLAVELLE, P.
773 $tConservation Biology$gv. 32, n. 6, p. 1380-1391, Dec. 2018.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Florestas (CNPF) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
